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The History of Lo-LIGHT Therapy

Until recent times it was believed that humans did not respond to the seasonal change in day-length, as other mammals do. In 1980, Dr. A. J. Lewy, a psychiatrist working at the National Institutes of Mental Health (NIMH), demonstrated that high-intensity light affects the natural release of melatonin by the pineal gland in the brain in people and reported it in the journal Science. This finding demonstrated that human physiology is influenced by light. Ref.

An engineer named Herbert Kern who suffered from depression saw that report of Dr. Lewy's study. He had noticed that his depression appeared at almost the same time each fall and remitted around the same time each spring. It occurred to him that that his depression might be related to changes in the amount of daylight that takes place as the seasons change. He approached Dr. Lewy to see if it be feasible to use light to treat his depression, and Dr. Lewy arranged to treat Mr. Kern's depression by extending his day length by creating an artificial summer. Mr Kern was exposed to two extra hours of bright light in the morning and in the evening.

In the early 1990's Sunnex Biotechnologies approached Dr. Lewy to test this new low intensity green light technology. After agreeing that tests conducted by Sunnex Biotechnologies indicated that nocturnal melatonin levels could be dramatically suppressed by low intensity of this green light Dr. Lewy, agreed to test the phase shifting ability of this new low-intensity green light on patients with Seasonal Depression (SAD). Dr. Lewy presented the impressive results of these studies to the Society for Light Treatment and Biological Rhythms and to the annual meetings of the Sleep Research Society and the American Sleep Disorders Association. Refs

There are now over ten studies published in major peer-reviewed journals which have shown that a Lo-LIGHT lamp providing less than 1/10 of the light intensity provided by "bright light" therapy lamp is equally effective for light therapy. Read more. This is in dramatic contrast to the results of studies with blue light and blue-enhanced light therapy lamps, where several recent studies have found that blue light is no more effective or efficient than white light. Read refs 1 and ref2.

While there is a great deal of promotion of blue light and blue-enhanced light therapy, more recent studies, whose authors include by many of the researchers whose earlier work is cited as validating the use of blue light therapy, have confirmed the original conclusions by the founders of Sunnex Biotechnologies by demonstrating that blue light, that is light consisting of wavelengths shorter than 480 nm provides no benefits for light therapy under normal conditions. Read more
Read more on clinical studies using GreenLIGHT technology.


Purchase or "No Risk" Rental Plans

In North America, a no-risk rental program is available on some models. If the unit is purchased within 2 months from the time of rental, all rental payments are applied towards the purchase price. Order Now!

The Sunnex Biotechnologies Lo-LIGHT phototherapy lamp comes with a five year warranty. Details